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We always lose the bottle cap or drop to he ground get dirty, herefore,we can only drink up the water or take a bottle which can spill whenever.We always need to consider where to put the cap or just hold it on hand when open the cap.This both not artistic and troublesome .Caps Position is only open a round hole in the bottom of it.people can put the cap in it easily. So peoplell no get the cap lost or dirty,also dont need to take the cap on hand.
Ruodan Chen Lihao Zhang